Woodworkers, this red aluminum T-track is super handy for building jigs and fixtures. It's the 45 Type, meaning the slot is 45mm wide and 12.8mm deep. You can get it in various lengths from 300mm (about 12\) up to 1220mm (about 48\). The red one comes without a scale; a silver version with measurement markings is also available. Screw it into your router table, table saw extension, or workbench to create adjustable stops, hold-downs, or featherboard mounts. The T-slot accepts standard T-bolts. Makes your shop setups more precise and repeatable. A simple upgrade that adds a lot of functionality.